JP2009046890A - Sensor mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor mounting structure having vibration proof effects on any vibration having low-to-high frequencies while improving the accuracy of a sensor and securing the durability of the sensor and vibration proof rubbers. <P>SOLUTION: On the upper part of a sensor mounting bracket 12, the first vibration proof rubber 30 is mounted which is provided with a first rubber material 32 having a small elastic coefficient. A connection member 40 is arranged on the upper part of the first vibration proof rubber 30. The first rubber material 32 is held between the connection member 40 and the sensor mounting bracket 12. On the upper part of the connection member 40, the second vibration proof rubber 50 is mounted which is provided with a second rubber material 52 having a great elastic coefficient. The second rubber material 52 is held between the connection member 40 and the sensor 20. Between the connection member 40 and the sensor mounting bracket 12, a supporting bar 60 is arranged for securing a space between the sensor mounting bracket 12 and the connection member 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sensor mounting structure, and more particularly to a structure for mounting a sensor such as an angle detector to a reader such as a pile driver or a ground improvement machine.

Sensors such as angle detectors for detecting the standing angle of leaders in pile driving machines and ground improvement machines are equipped with anti-vibration rubber to protect the sensors from vibrations during construction and transportation. It is attached at an appropriate position. As an anti-vibration rubber, one having an elastic coefficient that is effective for low-frequency vibration in the vertical direction generated when construction is performed with a hammer or an auger is used (for example, see Patent Document 1).
JP 2000-154539 A

  However, the anti-vibration rubber having an effect on the low-frequency vibration cannot sufficiently absorb the high-frequency vibration generated when the work is performed by a working apparatus such as a vibratory hammer, and the sensor may be damaged. On the other hand, it is possible to absorb vibrations from low frequency to high frequency by using anti-vibration rubber with a small elastic coefficient. However, when transporting a pile driver etc. Since a vibration in the lateral direction is applied to the vibration-proof rubber under the load of 1, the vibration-proof rubber having a small elastic coefficient cannot be used.

  Therefore, the present invention provides a sensor mounting structure that has a vibration-proofing effect against various vibrations from a low frequency to a high frequency, improves the accuracy of the sensor, and ensures the durability of the sensor and the vibration-proof rubber. It is intended to provide.

  In order to achieve the above object, the present invention provides a sensor mounting structure in which a sensor is attached to a sensor mounting bracket via a vibration isolating rubber, and the first vibration isolating rubber having a relatively small elastic coefficient as the vibration isolating rubber is relatively And a second anti-vibration rubber having a large elastic coefficient, and when the sensor is activated, a lower portion of the first anti-vibration rubber is fixed to the upper surface of the sensor mounting bracket arranged in the horizontal direction. A lower part of the second anti-vibration rubber is fixed to the upper part of the anti-vibration rubber via a connecting member, the first anti-vibration rubber and the second anti-vibration rubber are arranged in series vertically via the connecting member, and the second The sensor is fixed to the upper part of the anti-vibration rubber, and the sensor mounting bracket and the connecting member are allowed to move relative to each other in the vertical direction between the sensor mounting bracket and the connecting member. Provide holding means to restrict movement Preferably, the connecting member has a weight corresponding to an elastic coefficient of the first anti-vibration rubber, and the holding means moves from the sensor mounting bracket toward the connecting member. It can also be formed by a protruding columnar member and an insertion hole in which the columnar member provided in the connecting member fits loosely.

  According to the sensor mounting structure of the present invention, by using the first anti-vibration rubber having a small elastic coefficient, various vertical vibrations from a low frequency to a high frequency can be effectively absorbed, and the sensor in an operating state is protected. be able to. In a state where the sensor is tilted sideways when the sensor is not operated, the relative movement between the sensor mounting bracket and the connecting member is restricted by the holding means, so that vibration during transportation is not applied to the first anti-vibration rubber, The first anti-vibration rubber can be protected. Further, vibration during transportation is absorbed by the second vibration-proof rubber having a large elastic coefficient, so that the sensor can be protected.

  FIGS. 1 to 3 are views showing an example of a sensor mounting structure according to the present invention. FIG. 1 is a cross-sectional front view of a main part showing a state where the sensor is attached to a reader. FIG. 2 is an exploded perspective view showing the sensor mounting structure. FIG. 3 and FIG. 3 are side views showing a transported state in which the reader attached with the sensor is tilted.

  The present embodiment shows a structure in which a sensor 20 such as an angle detector is attached to a sensor mounting bracket 12 projecting from a leader 11 of the pile driving machine 10, and the sensor 20 is connected to the sensor mounting bracket 12 in the first manner. The anti-vibration rubber 30, the connecting member 40, the second anti-vibration rubber 50, and the support bar 60 are attached. The sensor 20 includes a rectangular flat mounting flange 21 at the bottom, and mounting holes 22 are formed at four corners of the mounting flange 21.

  The first anti-vibration rubber 30 is obtained by sandwiching a cylindrical first rubber material 32 between a pair of male screw members 31, and both the male screw members 31 are connected to the sensor mounting bracket via a nut 33 and a washer 34. 12 and the connecting member 40. Similarly to the first anti-vibration rubber 30, the second anti-vibration rubber 50 is obtained by sandwiching a cylindrical second rubber member 52 between a pair of external screw members 51. It is fixed to the connecting member 40 and the sensor 20 via a nut 53 and a washer 54, respectively. The first rubber material 32 and the second rubber material 52 are formed of a rubber material having a relatively small elastic coefficient, and the second rubber material 52 is relatively elastic than the first rubber material 32. It is made of a large rubber material.

  The sensor mounting bracket 12 is provided with a rectangular flat plate-like support plate 14 on the support members 13, 13 provided on the rear side of the reader 11, and the first anti-vibration rubber 30 is provided at four corners of the support plate 14. First screw insertion holes 15 through which the male screw members 31 are inserted are respectively formed, and bolt insertion holes 16 through which the fixing bolts 61 of the support bar 60 are inserted are formed at the center.

  The connecting member 40 functions as a connecting member that arranges the first anti-vibration rubber 30 and the second anti-vibration rubber 50 in series, and also functions as a weight that applies an appropriate load to the first anti-vibration rubber 30. The rectangular plate-like upper support plate 41 and lower support plate 42, and a substantially cross-shaped weight 43 provided integrally between the upper support plate 41 and the lower support plate 42 are formed in a substantially rectangular parallelepiped shape. A space for attaching a nut is formed between the upper support plate 41 and the lower support plate 42 at each corner. In the four corners of the lower support plate 42, second screw insertion holes 44 are formed coaxially with the first screw insertion holes 15 formed in the sensor mounting bracket 12, respectively. Third screw insertion holes 45 are formed on the same axis as the mounting holes 22 formed in the mounting flange 21 of the sensor 20. Further, a support bar insertion hole 46 through which the support bar 60 is inserted is formed in the center of the upper support plate 41, the lower support plate 42 and the weight 43 and coaxially with the bolt insertion hole 16 of the sensor mounting bracket 12. ing.

  The support bar 60 is a member having a cylindrical shape as a whole. The support bar 60 projects from the sensor mounting bracket 12 toward the connecting member 40, and the collar 62 is attached to the sensor mounting bracket 12. The fixing bolt 61, the nut 63, and the washer 64 for fixing are provided. The length of the collar 62 in the axial direction is the same as the length from the upper surface of the upper support plate 41 of the connecting member 40 to the upper surface of the support plate 14 of the sensor mounting bracket 12, and the length of the fixing bolt 61 in the axial direction. The collar 62 and the sensor mounting bracket 12 are formed so that the nut 63 and the washer 64 can be attached to the tip.

  Further, the outer diameter of the support bar 60 is slightly smaller than the inner diameter of the support bar insertion hole 46, for example, about 1 to 2 mm, and the support bar 60 is loosely fitted in the support bar insertion hole 46 so as to be between the two. A small gap 65 is present in the sensor mounting bracket 12 and the connecting member 40 is allowed to move relative to the support bar 60 in the axial direction and restrict movement in a direction perpendicular to the axial line. ing. That is, in the operating state of the sensor 20 in which the reader 11 stands, the connecting member 40 can move up and down with respect to the sensor mounting bracket 12 by elastic deformation of the first vibration isolating rubber 30, and the reader 11 is moved horizontally. In the non-operating state of the sensor 20 that has been tilted, the outer peripheral surface of the support bar 60 abuts on the inner peripheral surface of the support bar insertion hole 46, thereby causing the direction perpendicular to the axis of the support bar 60 (the state in which the reader 11 is erected) Then, it is formed so as to restrict the movement in the horizontal direction, and in the state where the reader 11 is lying down, the vertical direction).

  The four first anti-vibration rubbers 30 are formed by inserting one male screw member 31 into a first screw insertion hole 15 formed in the support plate 14 of the sensor mounting bracket 12 and projecting from the first screw insertion hole 15. A nut 33 is fastened to one end portion of 31 via a washer 34 to sandwich the sensor mounting bracket 12 between the male screw member 31 and the disk portion 35, and the other male screw member 31 is supported below the connecting member 40. A disk portion of the male screw member 31 is inserted into a second screw insertion hole 44 formed in the plate 42, and a nut 33 is fastened to the other end portion of the male screw member 31 protruding from the second screw insertion hole 44 via a washer 34. By sandwiching the lower support plate 42 between the first rubber member 32 and the lower support plate 42 of the connecting member 40, the first rubber member 32 is elastically deformable.

  The support bar 60 has the collar 62 inserted into the support bar insertion hole 46 formed in the connecting member 40, the lower end surface is brought into contact with the support plate 14 of the sensor mounting bracket 12, and the head of the fixing bolt 61 inserted through the collar 62. By tightening a nut 63 via a washer 64 to a front end male thread portion 61b protruding from a bolt insertion hole 16 formed in the support plate 14 of the sensor mounting bracket 12 in a state where the front end surface of the collar 62 is in contact with the end portion 61a. The support bar 60 protrudes from the center portion of the sensor mounting bracket 12 toward the connecting member 40.

  The four second anti-vibration rubbers 50 have one male screw member 51 inserted into a third screw insertion hole 45 formed in the upper support plate 41 of the connecting member 40, and a male screw member protruding from the third screw insertion hole 45. A nut 53 is fastened to one end of 51 via a washer 54 to sandwich the upper support plate 41 with the disk portion 55 of the male screw member 51, and the other male screw member 51 is attached to the mounting flange 21 of the sensor 20. The mounting flange 21 is inserted between the formed mounting hole 22, and a nut 53 is fastened to the end portion of the male screw member 51 protruding from the mounting hole 22 via a washer 54, and the disk portion 55 of the male screw member 51. By sandwiching, the second rubber member 52 is disposed between the upper support plate 41 of the connecting member 40 and the mounting flange 21 of the sensor 20 so as to be elastically deformable. Thereby, the sensor 20 is attached to the sensor mounting bracket 12 via the second vibration isolating rubber 50, the connecting member 40, and the first vibration isolating rubber 30.

  As described above, since the first rubber material 32 having a small elastic coefficient is disposed between the sensor mounting bracket 12 and the connecting member 40, vibrations from low frequency generated when construction is performed with a hammer, an auger, etc. The first rubber material 32 can effectively absorb up to high frequency vibrations generated during construction, and the sensor 20 during operation can be reliably protected. In addition, since the support bar 60 is provided, the vertical movement of the connecting member 40 when the reader 11 is tilted during transportation or the like can be suppressed, so that the load of the sensor 20 or vibration during transportation is applied to the first vibration isolating rubber 30. It is possible to prevent the first rubber material 32 having a small elastic modulus from being hung in the lateral direction, and the durability of the first vibration isolating rubber 30 can be ensured, and the second rubber material 52 having a large elastic coefficient can be secured. Is disposed between the connecting member 40 and the sensor 20, the second rubber material 52 can protect the sensor 20 from vibration during transportation when the reader 11 is tilted. Further, since the vibration isolating rubbers 30 and 50 are arranged at the four corners of the sensor mounting bracket 12 and the connecting member 40, the sensor 20 can be elastically supported with good balance.

  The rubber materials 32 and 52 of the anti-vibration rubbers 30 and 50 are appropriately selected from those having the optimum elastic modulus according to conditions such as the weight of the sensor 20 and the frequency range of vibrations generated during construction and transportation. What is necessary is just to select the weight 43 of the connection member 40 according to the characteristic of the 1st anti-vibration rubber 30 as the weight 43. Further, the number and shape of use of each of the anti-vibration rubbers 30 and 50 are also arbitrary, and the position, shape, and number of installation of the support bar 60 can be arbitrarily selected according to conditions such as load.

  Furthermore, the sensor is not limited to the angle detector, and can be applied to various sensors. The sensor mounting target is not limited to the leader of the pile driver. The present invention can be applied to various types of devices that are subject to vibration.

It is a principal part sectional front view showing the state where the sensor which shows one form of the present invention was attached to the construction machine. It is a disassembled perspective view which similarly shows the attachment structure of a sensor. It is a side view of the construction machine which shows the transportation state which also fell the leader which similarly attached the sensor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Pile driver, 11 ... Leader, 12 ... Sensor mounting bracket, 13 ... Support member, 14 ... Support plate, 15 ... First screw insertion hole, 16 ... Bolt insertion hole, 20 ... Sensor, 21 ... Mounting flange, 22 DESCRIPTION OF SYMBOLS ... Mounting hole, 30 ... 1st vibration isolator, 31 ... Male screw member, 32 ... 1st rubber material, 33 ... Nut, 34 ... Washer, 35 ... Disk part, 40 ... Connecting member, 41 ... Upper support plate, 42 ... Lower support plate, 43 ... weight, 44 ... second screw insertion hole, 45 ... third screw insertion hole, 46 ... support bar insertion hole, 50 ... second vibration isolating rubber, 51 ... male screw member, 52 ... second rubber material 53 ... Nut, 54 ... Washer, 55 ... Disk part, 60 ... Support bar, 61 ... Fixing bolt, 61a ... Head, 61b ... End screw part, 62 ... Collar, 63 ... Nut, 64 ... Washer, 65 ... Gap

Claims (3)

  In a sensor mounting structure in which a sensor is attached to a sensor mounting bracket via a vibration isolating rubber, a first vibration isolating rubber having a relatively small elastic coefficient as the vibration isolating rubber, and a second vibration isolating rubber having a relatively large elastic coefficient A lower part of the first anti-vibration rubber is fixed to the upper surface of the sensor mounting bracket disposed in the horizontal direction in a state where the sensor is activated, and a connection member is disposed on the upper part of the first anti-vibration rubber. The lower part of the second anti-vibration rubber is fixed, the first anti-vibration rubber and the second anti-vibration rubber are arranged in series vertically via a connecting member, and the sensor is fixed to the upper part of the second anti-vibration rubber. In addition, a holding means is provided between the sensor mounting bracket and the connecting member, which allows the sensor mounting bracket and the connecting member to move relative to each other in the vertical direction and restricts horizontal movement. Characteristic sensor mounting structure   The sensor mounting structure according to claim 1, wherein the connecting member has a weight corresponding to an elastic coefficient of the first vibration-proof rubber.   The holding means is formed by a columnar member projecting from the sensor mounting bracket toward the connecting member, and an insertion hole into which the columnar member provided in the connecting member is loosely fitted. The sensor mounting structure according to claim 1 or 2.

Images